(1946-50) Radio: Appeared (as "Sam Spade") in "The Adventures of Sam Spade". NOTE: Duff was forced out of the show when he was accused of being a "Communist sympathizer" during the notorious McCarthy era.
(1964) Unsold pilot: Co-starred in the pilot for a proposed CBS adventure series called "Calhoun" starring Jackie Cooper
and Barbara Stanwyck
(1956) Unsold pilot: Starred in a pilot for a proposed series to be called "I Love a Mystery." The series was not connected to the famous radio series of the same name, but was instead envisioned as an anthology of mystery stories. Duff starred as a detective in the pilot (not Sam Spade, however).
Radio: Appeared in such series as "Suspense," "Hollywood Star Playhouse" and "The Cavalcade of America."
(1974) Stage: Appeared in "Anniversary Waltz".
(1971) Narrator: "Alcatraz: Island of Hate," documentary.
(1974) Stage: Appeared in "Born Yesterday".
(1973) Stage: Appeared in "The Price".
(1975) Stage: Appeared in "Together Tonight! Jefferson, Hamilton and Burr".
(1/10/48) Radio: Appeared (as "Sam Spade") in a "Suspense" production of "The Khandi Tooth Caper".
(2/10/49) Radio: Appeared in the "Gracie Sends Sam Spade to Jail" episode of "The Burns & Allen Show".
(11/30/50) Radio: Appeared in a "Screen Guild Theater" broadcast of "Woman in Hiding".
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